t5601: remove clear_ssh, refactor setup_ssh_wrapper

Commit 8d3d28f added test cases for URLs which should be ssh.
Remove the function clear_ssh, use test_when_finished to clean up.

Introduce the function setup_ssh_wrapper, which could be factored
out together with expect_ssh.

Tighten one test and use "foo:bar" instead of "./foo:bar",

Helped-by: Jeff King <peff@peff.net>
Signed-off-by: Torsten Bögershausen <tboegi@web.de>
Signed-off-by: Junio C Hamano <gitster@pobox.com>

t/t5601-clone.sh

@@ -280,25 +280,26 @@ test_expect_success 'clone checking out a tag' '
 	test_cmp fetch.expected fetch.actual
 '
 
-test_expect_success 'setup ssh wrapper' '
-	write_script "$TRASH_DIRECTORY/ssh-wrapper" <<-\EOF &&
-	echo >>"$TRASH_DIRECTORY/ssh-output" "ssh: $*" &&
-	# throw away all but the last argument, which should be the
-	# command
-	while test $# -gt 1; do shift; done
-	eval "$1"
-	EOF
-
-	GIT_SSH="$TRASH_DIRECTORY/ssh-wrapper" &&
-	export GIT_SSH &&
-	export TRASH_DIRECTORY
-'
-
-clear_ssh () {
-	>"$TRASH_DIRECTORY/ssh-output"
+setup_ssh_wrapper () {
+	test_expect_success 'setup ssh wrapper' '
+		write_script "$TRASH_DIRECTORY/ssh-wrapper" <<-\EOF &&
+		echo >>"$TRASH_DIRECTORY/ssh-output" "ssh: $*" &&
+		# throw away all but the last argument, which should be the
+		# command
+		while test $# -gt 1; do shift; done
+		eval "$1"
+		EOF
+		GIT_SSH="$TRASH_DIRECTORY/ssh-wrapper" &&
+		export GIT_SSH &&
+		export TRASH_DIRECTORY &&
+		>"$TRASH_DIRECTORY"/ssh-output
+	'
 }
 
 expect_ssh () {
+	test_when_finished '
+		(cd "$TRASH_DIRECTORY" && rm -f ssh-expect && >ssh-output)
+	' &&
 	{
 		case "$1" in
 		none)
@@ -310,21 +311,20 @@ expect_ssh () {
 	(cd "$TRASH_DIRECTORY" && test_cmp ssh-expect ssh-output)
 }
 
+setup_ssh_wrapper
+
 test_expect_success 'cloning myhost:src uses ssh' '
-	clear_ssh &&
 	git clone myhost:src ssh-clone &&
 	expect_ssh myhost src
 '
 
 test_expect_success NOT_MINGW,NOT_CYGWIN 'clone local path foo:bar' '
-	clear_ssh &&
 	cp -R src "foo:bar" &&
-	git clone "./foo:bar" foobar &&
+	git clone "foo:bar" foobar &&
 	expect_ssh none
 '
 
 test_expect_success 'bracketed hostnames are still ssh' '
-	clear_ssh &&
 	git clone "[myhost:123]:src" ssh-bracket-clone &&
 	expect_ssh myhost:123 src
 '